Apparatus for stripping metal rolls



- 1943- F. F. HlLLlX ETAI. 2,337,017

APPARATUS FOR STIPPLING METAL ROLLS AND THE LIKE iginal Filed Aug. 14,1941 2 Sheets-Sheet l v //V VE N TORS F0575? E HILL/X and FPEDER/C u.LEACH, (0565/4550) ANN/1 MLEA CH (XECUTR/X) 14, 1943. F. F. HILLIX ET AL2,337,017

APPARATUS FOR STIPPLING METAL ROLLS AND THE LIKE Original Filed Aug. 14,1941 2 sh ts-Sheet 2 INVE N TO/? 8 FOSTER F HILL/X and FREDERIC J. LEACh, (015654550) A/V/VA M. LEACH (EXECUTR/ Patented ec. E4, 1943APPARATUS FOR STRIPPING METAL ROLLS AND THE LIKE Foster F. Hillix,Lakewood, Ohio, and Frederic J. Leach, deceased, late of Parma, Ohio, byAnna M. Leach, executrix, Lyons, N. Y., assignors to The American Steeland Wire Company of New Jersey, a corporation of New Jersey Originalapplication August 14, 1941, Serial No. 406,932. Divided and thisapplication June 18,

1942, Serial No. 447,576

6 Claims. (Cl. 76-4) Our invention relates to improvements in apparatusfor stipple finishing cold rolling rolls of the character employed forproducing stippled strip or sheet suitable for bonderizing, enameling orvarnishing, this application being a division of our pending applicationSerial No. 406,932, filed August 14, 1941.

It is a prime object of our invention to provide for stipple finishingcold rolling rolls, to produce throughout the surfaces thereof, minutesharply defined indentations and crests affording a proper tooth toimpart the uniform pattern thereof to the metal rolled by said rolls.

We have in view to provide for maximum localization of the surfacetreatment in order to minimize retreatment or overlapping of theroughening of the roll s'urfacathereby contributing to the productionand control of the desired formation of sharp indentations and crests inthe resulting stippling, and also to provide for minimizing the amountof metal stock worked on and removed from the roll surface. 7

The invention further contemplates the use of a granular cutting mediumor abrasive impressed or forced into the roll surface bya constantstatic direct force or pressure, enabling the' employment ofconsiderable power, limited only by the crushing strength of thegranular abrasive.

Other objects are to provide an improved apparatus readily adaptable tothe use of different sized granular abrasive or cutting medium to varythe character of the resulting stippling; to pro vide for uniformtreatment of the roll surface by following the contour thereof; toprovide for the accurate and sensitive control of the applied stipplingtreatment; and to provide apparatus capable Of economical and efficientoperation for the stated purposes.

Additional objects and advantages will become apparent from thefollowing description taken in connection with the accompanyingdrawings, wherein:

Fig. 1 is a diagrammatic plan view illustrating the apparatus of ourinvention;

Fig. 2 is an enlarged plan view of the abrasive applying means of Fig.1;

Fig. 3 is a side elevation of Fig. 2;

Fig. 4 is an end elevation of Fig. 3;

Fig. 5 is an enlarged view of a portion of Fig. 3, particularly showingthe mounting of the abrasive pressure roller;

Fig. 6 is a cross section taken on the line VI-VI of Fig. 5; and

Fig. '7 is a detail view showing the abrasive feeding device.

Referring to the drawings, the roll R to be treated in the manner and bythe means of the present invention is initially finished by grinding toa high degree of smoothness with the desired crown and contour. The saidroll is then placed in a lathe-like device, such as for example, theroll grinder diagrammatically illustrated in Fig. 1 including a powerdriven chuck or head 2 and a tail stock 3 mounted upon a suitable bed orbase 4.

At one side of the grinder or lathe, we provide a movable support ortraverse guide parallel with the roll axis, in the form of a shaft 5slidably mounted in bearings 6 on suitable vertical pedestals or postsindicated at 1, said shaft preferably being located at an elevation wellabove the roll axis. A horizontal brace 8 preferably connects thehousings of bearings 6 and is spaced from the shaft 5, thus providingarigid assembly for mounting and supporting the stippling unit S of ourinvention for movement thereof in a direction axially of the roll Rbeing treated.

The stippling unit S is designed and operable to apply a hard abrasiveto the roll surface by localized static pressure in such a manner as toform sharp well defined surface indentations and intervening crests inthe roll surface without elongation or scratching, whereby the rollsurface is eiliciently and uniformly stippled throughthe peripheraltravel of the roller and roll will be equal, we prefer to apply power toone of said members only and drive the other therefrom in the manner ofan idler, sufficient pressure being supplied therebetween as to maintainsaid members in rolling contact without slipping.

Since the roll R may be readily driven by means of the apparatus onwhich it is mounted, as illustrated in Fig. 1, we have found itexpedient, to employ the abrasive pressure roller 9 as the idler memberderiving its motion from the roll, and also have provided for theapplication of the desired static pressure to said roller 9.

Referring to Figs. 5 and 6, the roller 9 is provided with horizontaltrunnions l0 rotatably mounted in bearings I l and I2 respectivelydisposed in an enclosing housing l3 and a cover plate M therefor.Housing I3 is cut away and open at one side I5 thereof to expose aportion of the periphery of the roller 9, and is provided withoppositely disposed pivot arms l6 in the plane of the roller. Arms l6terminate in aligned trunnions I 1 rotatable in bearings iii in thespaced portions of a bifurcated yoke IS, the common axis of thetrunnions I! and their bearings being at right angles to that of theroller 9 and tangent to the periphery thereof.

For the purpose of renewing the roller 9, the same may be constructed asshown in Fig. 6, including a replaceable rim 9a of hardened materialbolted to the roller proper. For example, the said rim may be made oftungsten carbide. In order to effect such replacement,-the cover l4 maybe removed from housing I! and the roller bodily removed from saidhousing, without disturbing other portions of the apparatus. Theinterior of housing l3 may be connected with a suction hose or the like,as by a provided opening 20 at one side thereof, in order to remove dustand abrasive and prevent injury to the bearings II and I2.

A trunnion 2| is prov ded on the base member of the yoke I! at anelevation s ht y above the axis of the roller and at ri ht angles to theaxis of the trunn ons ilv sai trun ion 2| bein pivotally mounted by abearing 22 in a hub 23 of a b furcated arm or f k 24 rotatab v de endingfrom and support d by the shaft 5. as shown in Figs. 2. 3 and 4. T us,by means of the fo k 24. the roller 9 may be swun about the shaft 5 intoenga ement with the ro l R. the trunnions I1 and 2| prov ding auniversal mount ng for the roller to enable the same to follow thecontour of the surface of the roll R.

In order to advance the roller 9 into contact with the roll R and exerta suitable constant pressure on the latter by said roller, we provide aweight arm 25 pivotally mounted on the .shaft 5 and having adjustableweights 26 on the free end thereof, said arm normally extendinghorizontally over and resting on a suitable support, as for example, thebrace 8 extending between the pedestals I.

Disposed diagonally between and connecting the arm 25 and fork 24, weprovide a hydraulic piston and cylinder, the cylinder 21 being pivotallyconnected to the under side of arm 25 as at 23, and the piston beingpivotally connected by its extending rod 29 with the hub 23 of the yokeII, as at 30. With the arm 25 at rest upon the brace 3, the hydraulicpiston and cylinder are contracted to withdraw the roller 9 and its yokeaway from the roll R, as. when mounting or removing said roll from theapparatus.

To apply the roller 9 to the surface of roll R,-

the hydraulic cylinder 21 and its piston are extended, thereby firstengaging roller and roll, and then elevating the arm 25 above thesupport 3. With the arm 25 in the latter position, the weights 23thereof will exert a constant static force upon the roller 9 inproportion to said weights, the hydraulic cylinder and piston formingand maintaining a connecting link between the weight arm. fork 24 andits yoke l9.

With the roller 9 so engaged with the roll R under a constant appliedStatic pressure, a dry granular abrasive is applied to the bite betweenthe roll and roller, as indicated at a in Fig. 7. Various types andsizes of abrasive may be employed, it being desired to use a hardmaterial capable of withstanding considerable pressure. We have foundfused alumina to be such a material, and since it is relativelyinexpensive, it may be employed eiilciently and economically,

By reason of the fact that the roller 9 or its replaceable rim 9a ismaterially harder than the metal of the roll R, the applied force istransmitted through the abrasive to the roll surface, resulting in theabrasive cutting and forming indentations and producing interveningcrests in the metal of the roll surface, thereby producing the desiredstippled finish on the roll. The cold working of the metal of the rollis slight and produces an excellent tooth or roughness of the surfacewith the desired uniformity. The

line contact between roll and roller effects a desirable localization ofthe applied pressure so as to uniformly force the abrasive particlesinto the roll surface as the same pass between the roll and roller, suchlocalization serving to prevent overlapping as the treatment progressesover the roll surface.

We have found that the said stippling treatment may be accuratelycontrolled and regulated for the desired results by applying a pressureto the roller 9 limited only by the crushing strength of the abrasive,and that the pressure range thus made available is entirely suilicientto effect an adequate cutting deformation of the roll surface. Further,by varying the size of the abrasive, the character and degree of theresulting stippling may be varied as desired, and the abrasive pres-'-sure roller of our invention may be readily employed for a large rangeof such sizes.

It will be seen that by applying the abrasive in a. thin flat streamacross the face of the roller 9,

the cutting zone is limited to the width of the roller face, and byimparting the necessary traverse to the roller mounting, the entiresurface of the roll may be treated. For example, chains 3| may beprovided, driven by suitable means, and connected to the assembled fork24 and weight arm 25 at the shaft 5, to traverse the roller mounting onsaid shaft across the surface of the roll R, as indicated by the arrowin Fig. 1.

Suitable means may be provided for feeding the abrasive to the bitebetween the roll and roller. For example, a hopper 32 may be mountedupon the stippling unit S, as upon the arm 25, said hopper having a feedvalve 33 controlling the flow therefrom to a flexible conduit 34.Conduit 34 connects a feed nozzle 35 mounted on the housing l3immediately above the bite of the roll and roller, said nozzle includingan adjustable control gate 36, the nozzle and gate coacting to deliver auniformly thin flat stream or layer of abrasive transversely betweensaid roll and roller.

From the foregoing description, it will be apparent that the abrasive isapplied to the roll surface and forced thereinto by the applied radialnormal pressure of the roller 9, the static uniform pressure of saidroller serving to effect a nonslipping travel of the roller over therollsurface, thereby producing a sharp stippling action without scratches orelongated indentations.

Various changes and modifications are contemplated within the scope ofthe following claims.

We claim: a

1. A device for stippling metal rolls and the like, including a support,a member pivoted theremember for exerting the weight thereof upon theroller when the latter is engaged with the work,

' weight of the arm from the member, a contractible and extensibleconnection between the member and arm for moving the member to engagethe roller with the work and elevate the arm above its support, tothereby transmit the weight of the arm to the member and roller, and anabrasive feeding device disposed adjacent the roller for feeding agranular abrasive tothe zone of contact of the roller and work.

2. A device for stippling metal rolls and the like, including an armpivoted for swinging movement toward and away from the work surface, anabrasive pressure roller, means pivotally mounting said roller on thearm about a pair of substantially normal axes, one of said axes beingsubstantially tangent to the roller periphery,

. means for exerting a constant static force urging the roller intocontact with the work, and means for feeding a granular abrasive intothe zone of contact of the roller and work.

3. A device for stippling metal rolls and the like, including an armpivoted for swinging movement toward and away from the work surface, anabrasive pressure roller, means pivotally mounting said roller on thearmabout a pair of substantially normal axes, one of said axes beingsubstantially tangent to the roller periphery and l the other beingdisposed above the axis of saidroller adjacent the region of contact ofthe latter with the work, means for exerting a constant static forceurging the roller into contact with the work, and means for feeding agranular abrasive into the zone of contact of the roller and work.

4. In apparatus of the character described, the combination with meansfor rotatablysupporting a. metal roll, of means for stippling the rollsurfaceincluding an abrasive pressure roller, a universal mountingrotatably supporting the roller in rolling contact with the rollsurface, means for exerting a constant static pressure upon the rollerurging said roller into contact with said roll surface, said universalmounting permitting self-adjustment of the roller in response to thecontour of the roll surface to thereby maintain substantial line contactbetween said roller and said surface, an abrasive feeding device forfeeding a granular abrasive into the bite between the roll and roller,means for rotating one of thelatter. and means for effecting relativetraverse of the roll and roller simultaneously with said rotation.

5. In apparatus of the character described, the combination with meansfor rotatably supporting a meta1 roll, of means for stippling the rollsurface including an abrasive pressure roller, a universal mountingrotatably supporting the roller in rolling contact with the rollsurface, a pivoted weight arm, means for selectively transmitting theweight of said arm to the roller mounting for exerting a constant staticpressure upon the. roller urging the latter into contact with said rollsurface, said universal mounting permitting self-adjustment of theroller in response to the contour of the roll surface to therebymaintain substantial line contact between said roller and said surface,an abrasive feeding device for feeding a granular abrasive into the bitebetween the roll and roller, means for rotating the roll, and means fortraversing the stippling means axially of the roll simultaneously withsaid rotation.

6. A device for stippling metal rolls and the like including an armpivoted for swinging movement toward and away from the work surface, anabrasive pressure roller, means pivotally mounting said roller on thearm'about a pair of substantially normal axes for free universalselfadjustment of said roller upon and in response to the contour of thework surface, means for exerting a constant static force urging theroller into contact with said surface, and means for feeding a granularabrasive into the zone of contact of the roller and work surface.

' FOSTER F. HILLIX. ANNA M. LEACH.

Deceased.

